Catechism of the Catholic Church §1492 — excerpt
Repentance (also called contrition) must be inspired by motives that arise from faith. If repentance arises from love of charity for God, it is called "perfect" contrition; if it is founded on other motives, it is called "imperfect."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.